linux/arch/nios2/kernel/sys_nios2.c
Ley Foon Tan 1000197d80 nios2: System calls handling
This patch adds support for system calls from userspaces. It uses the
asm-generic/unistd.h definitions with architecture spcific syscall.
The sys_call_table is just an array defined in a C file and it contains
pointers to the syscall functions.

Signed-off-by: Ley Foon Tan <lftan@altera.com>
2014-12-08 12:55:58 +08:00

54 lines
1.2 KiB
C

/*
* Copyright (C) 2013 Altera Corporation
* Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2004 Microtronix Datacom Ltd.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/export.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <asm/cacheflush.h>
#include <asm/traps.h>
/* sys_cacheflush -- flush the processor cache. */
asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
unsigned int op)
{
struct vm_area_struct *vma;
if (len == 0)
return 0;
/* We only support op 0 now, return error if op is non-zero.*/
if (op)
return -EINVAL;
/* Check for overflow */
if (addr + len < addr)
return -EFAULT;
/*
* Verify that the specified address region actually belongs
* to this process.
*/
vma = find_vma(current->mm, addr);
if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
return -EFAULT;
flush_cache_range(vma, addr, addr + len);
return 0;
}
asmlinkage int sys_getpagesize(void)
{
return PAGE_SIZE;
}